|
|
jsspace 发表于 2014-7-2 10:56 ) ]9 P' w! {1 e2 f F* `
次级不能接地,这个在61347-2-13上已经明确说明了
" @! H7 r3 v& n) w. ] |4 Q依据IEC61347-2-13 Clause 8.2, 满足条件的SELV都可以被人接触到,为什么不可以接地?6 H& E( Y4 C0 \. O
) [+ L, U8 w, j9 X
8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if2 `- M: _ U, O9 K. @6 z1 e
– the rated output voltage for constant voltage control gear or maximum output voltage for
4 ]4 _: w! e! S* {constant current control gear under load does not exceed 25 V r.m.s.;
: E, S1 X1 R4 i, \8 \, o' ]– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed" u7 \* f9 r& G4 r% {8 b& i
33 2 V.
; D& F7 H. B' M% D0 C/ U- CCompliance is checked by measuring the output voltage when steady conditions are
; P- N+ N0 L1 L3 S( Mestablished, the controlgear being connected to rated supply voltage and rated frequency. For
, ^. f* A5 A+ _& U! {0 Y3 E# y! @the test under load, the controlgear is loaded with a resistance which would give rated output
4 ?, l9 \6 G1 E4 d2 K0 Oat rated output voltage.
& A! Z. l. D, v9 yFor controlgear with more than one rated supply voltage, the requirement is applicable for% w! j& M" ], J- w4 {) j- w
each of the rated supply voltages., V: Y/ @# C6 n7 ^
Controlgear with a rated output voltage above 25 V shall have insulated terminals. |
|